Yun Xiang, a gentle 17-year-old girl longing for warmth and family, is taken in by the Cheng family after a sudden upheaval in her own. There, she becomes “siblings” with Cheng Che, a boy her age. Cold and distant, Cheng Che has grown up under the shadow of his parents' divorce and greets Yun Xiang's arrival with hostility. The story begins as Yun Xiang moves into the Cheng household. Despite Cheng Che's indifference and rejection, she tries her best to adapt and become part of this new family. Cheng Che, sensitive about his family situation and fiercely protective of his mother's limited attention, sees Yun Xiang as a threat—someone who might steal the last bit of love he feels he has. As a result, he keeps his distance, treating her with coldness both at home and at school.